Unless there is a bug in there, this property value should exists. All the various SDKs out there are based on the vSphere API, if you have VMware support, you may want to file a support request to confirm this or if you're just missing something.
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William Lam
VMware vExpert 2009
VMware ESX/ESXi scripts and resources at:
VMware Code Central - Scripts/Sample code for Developers and Administrators
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